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copied!<p>I recently wrote a blog post about this issue and how to reproduce it.</p> <p><a href="http://mikehadlow.blogspot.co.uk/2013/06/nuget-install-is-broken-with-f.html" rel="nofollow">http://mikehadlow.blogspot.co.uk/2013/06/nuget-install-is-broken-with-f.html</a></p> <p>I've copied in the start of it below as requested:</p> <p>There’s a very nasty bug when you try and use NuGet to add a package reference to an F# project. It manifests itself when either the assembly that is being installed also has a version in the GAC or a different version already exists in the output directory.</p> <p>First let’s reproduce the problem when a version of the assembly already exists in the GAC.</p> <p>Create a new solution with an F# project.</p> <p>Choose an assembly that you want to install from NuGet that also exists in the GAC on your machine. For ironic purposes I’m going to choose NuGet.Core for this example.</p> <p>It’s in my GAC:</p> <pre><code>D:\>gacutil -l | find "NuGet.Core" NuGet.Core, Version=1.0.11220.104, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL NuGet.Core, Version=1.6.30117.9648, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL </code></pre> <p>You can see that the highest version in the GAC is version 1.6.30117.9648</p> <p>Now let’s install NuGet.Core version 2.5.0 from the official NuGet source:</p> <pre><code>PM> Install-Package NuGet.Core -Version 2.5.0 Installing 'Nuget.Core 2.5.0'. Successfully installed 'Nuget.Core 2.5.0'. Adding 'Nuget.Core 2.5.0' to Mike.NuGetExperiments.FsProject. Successfully added 'Nuget.Core 2.5.0' to Mike.NuGetExperiments.FsProject. </code></pre> <p>It correctly creates a packages directory, downloads the NuGet.Core package and creates a packages.config file:</p> <pre><code>D:\Source\Mike.NuGetExperiments\src>tree /F D:. │ Mike.NuGetExperiments.sln │ ├───Mike.NuGetExperiments.FsProject │ │ Mike.NuGetExperiments.FsProject.fsproj │ │ packages.config │ │ Spike.fs │ │ │ ├───bin │ │ └───Debug │ │ │ └───obj │ └───Debug │ └───packages │ repositories.config │ └───Nuget.Core.2.5.0 │ Nuget.Core.2.5.0.nupkg │ Nuget.Core.2.5.0.nuspec │ └───lib └───net40-Client NuGet.Core.dll </code></pre> <p>But when when I look at my fsproj file I see that it has incorrectly referenced the NuGet.Core version (1.6.30117.9648) from the GAC and there is no hint path pointing to the downloaded package.</p> <pre><code><Reference Include="NuGet.Core, Version=1.6.30117.9648, Culture=neutral, PublicKeyToken=31bf3856ad364e35"> <Private>True</Private> </Reference> </code></pre>

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